Threaded Injector Mount

Abstract

A system for mounting an injector to an exhaust conduit in an exhaust treatment system includes a boss having an externally threaded surface. The boss is adapted to be fixed to the exhaust conduit. A retention member is adapted to be coupled to the injector housing to transfer an axial load to the housing. An internally threaded nut includes a flange engaging the retention member. The nut threadingly engages with the boss to clamp the housing of the injector to the boss as the nut is rotated.

What is claimed is: 
     
         1 . An injector mounting system for mounting an injector to an exhaust conduit in an exhaust treatment system, the injector including a housing and an orifice that directs a flow into the exhaust conduit, the injector mounting system comprising:
 a boss including a radially extending flange and an externally threaded surface, the boss being adapted to be fixed to the exhaust conduit;   a retention member adapted to be coupled to the injector housing to transfer an axial load to the housing; and   an internally threaded nut including a flange engaging the retention member, the nut being threadingly engaged with the boss and adapted to clamp the injector housing to the boss as the nut is rotated.   
     
     
         2 . The injector mounting system of  claim 1 , further including a gasket engaging the boss flange and spacing the injector housing away from boss. 
     
     
         3 . The injector mounting system of  claim 2 , wherein the nut axially displaces the retention member to compress the gasket between the boss flange and the injector housing. 
     
     
         4 . The injector mounting system of  claim 3 , wherein the nut and boss are sized to remain spaced apart from the injector housing to define a thermally insulating pocket of air between the injector housing and the boss. 
     
     
         5 . The injector mounting system of  claim 1 , wherein the retention member includes a retaining ring. 
     
     
         6 . The injector mounting system of  claim 1 , wherein the nut flange and the boss flange are axially spaced apart from each other. 
     
     
         7 . The injector mounting system of  claim 1 , wherein the boss flange includes an aperture adapted to receive a reduced diameter end of the injector housing. 
     
     
         8 . An injector assembly for injecting a fluid into an exhaust conduit of an exhaust treatment system, the injector assembly comprising:
 an injector housing including an orifice;   a valve member positioned within the housing and being moveable to allow and cease a flow of fluid through the orifice;   a boss including an externally threaded surface, the boss being adapted to be fixed to the exhaust conduit;   a retention member adapted to be coupled to the injector housing; and   an internally threaded nut engaging the retention member, the nut being threadingly engaged with the externally threaded surface of the boss, wherein the rotation of the nut axially drives the retention member, which in turn, axially drives the injector housing toward the boss to clamp the injector housing between the nut and the boss.   
     
     
         9 . The injector assembly of  claim 8 , wherein the injector housing is substantially cylindrical and includes a groove in receipt of the retention member. 
     
     
         10 . The injector assembly of  claim 9 , wherein the boss includes an aperture in receipt of a reduced diameter portion of the injector housing. 
     
     
         11 . The injector assembly of  claim 10 , wherein the injector housing includes a radially extending land reacting the clamping load. 
     
     
         12 . The injector assembly of  claim 11 , wherein the boss includes a radially extending flange reacting a load transferred through the land. 
     
     
         13 . The injector assembly of  claim 12 , further including a gasket sandwiched between the land and the boss flange to thermally isolate the injector housing from the boss. 
     
     
         14 . The injector assembly of  claim 13 , wherein the retention member includes a retaining ring. 
     
     
         15 . The injector assembly of  claim 8 , wherein the nut includes a radially extending flange engaging the retention member. 
     
     
         16 . The injector assembly of  claim 15 , wherein the nut flange and the boss flange are axially spaced apart from each other.